The problem is when I click 'View LinkedIn Profile'
Where is that link supposed to go? JFBConnect by itself doesn't show a user's profile. We can import the user's profile and avatar into various other extensions, which are meant for profile management, like EasySocial, JomSocial, Community Builder, Kunena, K2 or even the basic Joomla User - Profile plugin.
Let us know more about how you're testing, what link you're clicking, what URL is giving the 404, etc and we'll gladly help investigate or answer as best as we can.
Thanks,
Alex